They debuted on December 1, 2011 with the self-titled mini album Trouble Maker.
The duo effectively disbanded following Hyuna's departure and contract termination from Cube.
On November 25, the unit started revealing teaser photos for the debut with a private-party concept. The duo also performed at the 2011 Mnet Asian Music Awards, which included an on-stage kiss. On December 1, the duo debuted with the mini album Trouble Maker.
On October 28, the group released the single "There Is No Tomorrow" from their second mini album, Chemistry.